DutchRailnut wrote:The Genesis is from 1992 the DE/DM is from 1995, EMD had no interest in designing a car body that would fit the tight north east clearances, GE was up to a challenge.
EMD took the competition in 1991 with GE very seriously for the AMD-103 specified by AMTRAK. In fact, word was received on the last day of work before the Christmas shutdown in 1991 that GE had won the business, so the Director of Engineering held a last minute meeting to ream the troops before the holiday.
The model was to be an F70 using fabricated trucks from Henschel in Germany, now part of Bombardier, and a semi-moncoque carbody. It was a totally new design but quickly forgotten once the business was lost. The intital LIRR DE/DM30AC concept was partly based on the F70 but as the LIRR spec came out and EMD alliances changed from Henschel to Siemens, the design became more based on the Krupp monocoque carbody GE used, along with a derivative of the P40 truck incorporating disc brakes. With the exception of the radius between the sidewall and roof of the DE/DM, that loco meets AMTRAK's NEC clearance diagram. The radius was incorporated to match the C3 coach profile, which AMTRAK approved for specific tunnels, but for other customers such as NJT, a slope replacing the radius would have been used, fully meeting AMTRAK's diagram. Alas, that was never necessary as EMD abandoned the passenger business after the LIRR experience.