You cautiously enter, scanning the dilapidated seats for signs of movement. The cart seems completely empty. Seeing nothing of interest, you try to open the door to the next coach - only to find the door locked, and no sign of a key. Perplexed, you settle into one of the old leather seats and consider your next move. It seems you can either go back to the previous carts or try to find a way to open the door.
You start to relax, when suddenly the dark shape leaps out from beneath your feet, scrambling away.
...Just a cat. It looks up at you with wide eyes, but doesn't seem aggressive. Eventually it wanders over to you, tail held high. Looks like you have a choice to make.

Will you pet the kitty?

Yes
No

You have chosen to PET THE KITTY.
The cat purrs and rubs its face against your hand, and after a few moments flops onto its back. You can now see that it has a collar around its neck, and attached to the collar - a key. You gently tug the key free of the collar, giving the little cat a few belly rubs as thanks. The cat enjoys the attention for a few more moments, purring furiously, then strolls off with its tail still standing at attention.
You approach the cabin door, and as you slide the key into the lock, you can hear the distant clickety-clack of someone typing furiously.

View attached image.