1. When you use a steam bottle you get a bucket instead of a glass bottle (I think it has more logic).
2. The steam of steam traps is invisible.
3. Don't know if you want it, but you can "swim" in steam, and get drown.

hope it helps.

Version:
Railcraft_1.6.2-7.3.0.11
forge 9.10.0.827

1. Fixed.
2. Cannot duplicate.
3. Fixed.