Yes but the buffet would be only for the medical and support staff, to enable provision of light meals, chilled soft drinks, and hot drinks.
Not available to the public, so does not count as a "broadgage approved Buffet"

As has already been said, an existing building is arguably more suited to use as a vaccination center than a train.
A train might be worth considering for remote areas, staff and supplies could remain on board as the train visits numerous stations.
A shortened HST^▸ (High Speed Train) would be ideal, perhaps three first class vehicles and a buffet for staff refreshments.

The vaccine that only needs refrigeration could be stored in one of the existing fridges.
If the vaccine that needs storage at minus 70 degrees is to be used, this would need to be stored in a dedicated vehicle with the windows removed or broken, or the doors removed.

A train with all the required supplies, welfare facilities, and staff on board is almost certainly easier to arrange than transporting everything required to numerous isolated locations.

For an urban area, a large existing public building is almost certainly the answer.

Agree, a friend of mine has made numerous voyages by cargo ship and highly recommends this mode of transport.
Cabin-----excellent, would be called "super double emperor class" or some such nonsense on a cruise ship.
Food------Limited choice but of excellent quality, included in fare.
Drink-----Again limited in choice but very cheap, had to be paid for at "duty free" prices, not pub or bar prices. Soft drinks FOC^▸ (Freight Operating Company).
Entertainments and communications limited to satellite TV, radio, library, DVDs, and very expensive sat phone.

Reasonably green. Ships use a lot of low grade and polluting heavy oil, but the EXTRA fuel used by adding a passenger is negligible.

Most voyages were between the UK and the USA, but included one direct voyage to Australia.
One voyage was in truly extreme weather, with the shipping weather forecast describing the sea state as "phenomenal" The very experienced Captain looked worried, and the officers kept checking the lifeboats.
The crew were observed to be praying for deliverance.

Other voyages have been less exciting.

Wind is not consistent, but it is very predictable in the short term. The wind does not suddenly drop without this being accurately forecast. The forecast of calm conditions gives ample time to ready other generating plant. The challenge will come when we no longer have fossil fueled generating capacity.

Battery storage is showing great promise and very considerable expansion is planned.
Liquid air energy storage is also showing considerable promise.
Pumped storage works fine, but has limited potential for expansion due to lack of suitable locations.

The relatively small nuclear reactors proposed by Rolls Royce sound a good idea if they can be delivered affordably and on time. One such reactor would meet about 1% of peak demand, a dozen would help significantly. I remain opposed to Hinkley C due to the ballooning cost.
I remain opposed to Chinese involvement in nuclear power for both national security reasons and due to concerns about build quality.

As has already been said, there is not any overnight surplus of renewably generated electricity.
As more wind turbines are erected, less natural gas is being burnt, but SOME gas is still used.

The day when there WILL be a surplus of renewable electricity is however getting nearer. During the last few hours, electricity from natural gas has dropped to only 3 or 4 Gw, an unusually low figure. A 50% increase in wind turbine capacity could see gas drop to zero.
Not all the time of course but under favourable conditions.

For the least few days, electricity from wind has been the largest input to the grid, not continually, but nearly so.

I would say,

"An extra time inserted in the working timetable, between the theoretical time required, and the actual time allowed for a journey. Primarily to allow for slight delays in awaiting a path. The timetable should be planned so as to avoid having to wait for a path, if however other services are running late then the train question may have to wait."

Example; An express train from the West country is due to pass west worzelshire junction at 10-40, five minutes after a local train. Last year the local service was often a few minutes late, and the express therefore held at signals before the junction. So this year a pathing allowance of 3 minutes has been added to the working timetable for the express.

An alternative policy might be to hold the late running local clear of the junction until the express had passed. In that case the pathing allowance would be applied to the local.

Despite planning, delays approaching a congested London terminus are likely, and a pathing allowance therefore added.

Excessive pathing allowances have become known as "charter minutes"

Felixstowe may not have silted up but is reported to be "in chaos" with long delays to both ships and to trucks collecting containers for onward distribution.

https://www.bbc.co.uk/news/business-54908129

In my view, the exact design of station seating is being over considered.
Most stations IMHO^▸ (in my humble opinion) need MORE seating, of a cheap, simple, robust and vandal resistant design. The existing perforated bent steel benches are acceptable, but would be improved by adding arm rests at each end.

Quantity is more important than quality in my view.

Many of us have seen the recent TV series about Paddington station, and the various delays and breakdowns that have occurred. In most such cases, more concourse seating would have been appreciated.

Another problem is seating INTENDED for use of any passenger, but which becomes "misappropriated" by station catering outlets. At Kings Cross in particular I have observed this.
Try sitting on some seats that are intended for any passenger !
"Would you like to order straight away sir ?"
" Not just yet, I will leave a menu for you"
"Would you like a drink whilst deciding on your order ?"

And similar inquiries that don't actually state that "you must order food or drink to sit here" but certainly IMPLY this.

No they are too flimsy, the first good wave would detach the bus body from the goods wagon frame.

Yes it might be worth either splitting this thread, or perhaps editing the title to include "energy production and storage" or some similar wording.

I remain very doubtful about hydrogen to power vehicles, it is inherently expensive, bulky, hard to store, hard to transport and explosive.

Hydrogen MIGHT be viable for static energy storage, but I suspect that utility scale batteries will take much of that market.
Liquid air shows considerable promise.
A merit of liquid air is that large rotating turbines are used to generate the power. These assist in maintaining a stable grid frequency.
Batteries or fuel cells connected via static inverters contribut to INSTABILITY.

Interesting, I presume that the actual driving is done by adults, but there is no real reason why sensible children cant perform most other roles.
A lot of maintenance and repair work could be done by older children, but I suspect that the more dangerous worshop machinery and hazerdous chemicals are restricted to adults.
Signalling is presumably interlocked to protect against human error.

And we should remember that within living memory, that 14 year olds worked on UK^▸ (United Kingdom) railways, they were called apprentices and not children then.
It is alleged that rural signal boxes where left in the charge of the signalmens children at times, at least up to the last war.

I am very doubtfull indeed about this.
The passenger carying pods will run in a tube containing vaccuum, and will therefore need to be pressure tight and carry a reserve of air, and means of removing carbon dioxide, More like a spacecraft than a train. Any failure of the pressurisation will quickly suffocate the passengers.
And how are thousands of miles of vaccuum tube to be kept air tight ? Even a slight imperfection will destroy the vaccuum. Any defect in a tube below water, or below the water table on land will fill the tube with water.
The capsules presumably cant move through water, so everyone suffocates in the sealed capasule, or excapes and drowns.

Very silly idea IMHO^▸ (in my humble opinion).

Yes, I said "promoter" to avoid argument from any pedant whom might point out some subtle difference "HS2 Ltd" and "HS2" but they are in effect the same thing.

Anything published by HS2^▸ (The next High Speed line(s)) promoters is probably a bit optimistic, but is most unlikely to contain significant factual errors.