At once time I owned every TMCC Geep made. These engines pretty much contain the history of Railsounds because there were several made with each version. As it applies to the features of each:
RS2 - the NYC and SP versions had no crewtalk or towercom and you have to manually with the Cab1 raise the engine RPM sounds past the second level. 2.5 has engine specific crewtalk and towercom. The RPM sounds are still manually raised past level two. An example is the CB&Q or B&M set. And the RPM levels have to be manually lowered on both of the above versions once raised. RS3 the RPM levels go up or down up to the fourth level by them self depending on the speed of the engine. Examples are the silver CB&Q the ACL and the Wabash set. Most are like this. Further evolution produced among others, the FEC set, then NS in a set, the NP model and the Rock Island. The RI was the last TMCC Geep made and the only one with two towercom announcements, one saying hold and the second giving the green light, activated by Aux1-7. I wish I had kept the Custom series Geeps, with the dragster sounds. The sounds in these beauties are activated by the engine speed only, you can't manually raise and lower the engine RPMs. Which makes for a lot of fun playing around with them, trying to audibly burn rubber at all four levels. And I think in at least the first version it was made at the time of Railsounds 2.5, where in the other engines made at that time the RPMs were manually driven. I always found that interesting. Just thought I 'd share what the different versions do on the track. I liked manually operating the sound levels in the early versions of Railsounds. It was fun to play with. Heck, I liked them all. Great sounds in those engines. And like I said, you can pretty much follow the evolution of Railsounds with the TMCC Geeps.
