Maybe we need an RAC for trains. Doesn’t this sound just what’s needed:
On the East Coast Mainline they are called Thunder Birds, loco strategically located along the Route there is usually one berthed outside Kings Cross Box. The West Coast also has Thunder Birds.
GWR▸ has not generally had to rely on needing them principally because
HST▸ 's have in effect 2 locomotives per train.
The Thunder Birds don't carry fitters as that would be a waste of rare and highly skilled workers