Mineral hardness scale for amended journeys

[whole diary]

[grahame]

There are ten minerals in Mohs scale: talc, gypsum, calcite, fluorite, apatite, feldspar, quartz, topaz, corundum and diamond.

Would it be useful for us to described how damaging the effect of a change from plan for trains is using the Mohs scale - for example, this morning here is an example of Talc - a train on which a reduction from 3 cars to 2 isn't going to be any sort of problem, and it still makes all of its calls at the planned time.

08:22 Westbury to Swindon due 09:07
Facilities on the 08:22 Westbury to Swindon due 09:07.
This is due to more trains than usual needing repairs at the same time.
Will be formed of 2 coaches instead of 3.

An example of Diamond - should be very rare - is a meltdown such that passengers cannot make their journey to arrive within 3 hours of when they had planned, alternative replacement transport not provided.

[Oxonhutch]

Ah Mohs' Hardness Scale - that take me back several decades. I once successfully scratched a quartz pebble with a diamond I found on a pre-Namibian beach. Last night's signal failures and subsequent cancellations at Reading were about calcite in effect though I was was fearing an apatite attack. For finer granularity, your fingernail is 2.5 and your compass point is about 6.5.

[Red Squirrel]

I thought Moe's Hardness Scale was:

Duff Beer; Henry K. Duff's Private Reserve; Tuborg (The Beer Of Danish Kings); and Red Tick Beer, a beer flavoured with dogs.

[GBM]

I thought Moe's Hardness Scale was:

Duff Beer; Henry K. Duff's Private Reserve; Tuborg (The Beer Of Danish Kings); and Red Tick Beer, a beer flavoured with dogs.

Being totally unscientific my first thought was also connected with that yellow family