I have all sorts of keys, half of which I don't have a clue what they do. The ones I do know include BR1 key, t key, set of station keys.
Bardic, high vis, shunters smock thing, huge holdall, wintercoat, rubberised waterproof coat thing, bodywarmer, whistle, pens and junk, watch, 'uniform' (which stooped to a new low of white shirt and black trousers on saturday), toe cap boots, WTT booklet, local instructions booklet thing, signalling diagrams, t key holder thing, paper wtt (invaluable for shunt hand signals), some gloves, work permit/grade card
And the one you've all forgotten which is disgraceful,
TEA