These are fairly old drawings, but...
Henriette, a steam powered android built as an art piece in a futuristic high tech world, now centuries after the apocalypse she's the one of the only androids in working order, but she relies on steampunk prosthetics to get around.
One can hear her steady 'heartbeat' in the form of her main steam engine chuffing, and the faint whine of her dynamo which powers the electronics in her brain and her original muscles and skin. When she is working hard her heartbeat becomes a loud huffing and puffing and she breathes smoke and steam. She has a whistle which she can blow but it mostly gets used when she's startled. It's a big deep whistle hidden in her torso--her whole body hisses steam from every joint when she blows it.
She was originally built to burn fuel oil but times are tough these days and she has to make do on any fuel she can--vegetable oil, used motor oil, wood, coal; sometimes she even has to do coke.
Okay I might have latched onto the 'train' aspect more than the 'steampunk' buuuuuut the thought of her having a train whistle and instant steam cloud was too cute not to try and draw 🥺
