css9450
Veteran
Is this a piece of equipment you're going to have to hide from your employer? Some (many?) railroads frown upon employees carrying cameras, if they're not officially prohibited outright. So, perhaps the smaller, the better.
If it has to be film, I'd go along with the others recommending a small P&S.
If it has to be film, I'd go along with the others recommending a small P&S.