I've added a Critical Strike pallet that is unlocked by earning achievements. Collecting this pallet will increase all damage from your locomotive by 3x.
I've also added some new ability unlocks which are to increase the duration of the EXP magnet, Air Strike, and Critical Strike.
I noted the Thompson sub machine gun was a little bit underwhelming so I've given it a little bit more oomph. Also I've changed what weapons the Milwaukee steam locomotive can have to make it a lot more effective and fun to play with.