While we are on the subject,is it possible to upgrade to an EB turbo for the older locomotives. The entire utex pool for marine engines was purged of E turbos for 17.9 EB turbos about 1982. That and the spring drive gear helped a lot in the torsional problems resulting in frequent clutch failure especially on 12 cylinder engines. The 40 series locomotives had E engines while the 50 series introduced the F series. Did EMD produce some 40 series locomotives with the EB and EC engines without a change in model designation. There are several marine units built to those model designation and older units have up graded components mostly laser hardened liners and pistons with hardened ring lands. They also keep up with the latest advances in fuel injectors. There is a lot of stuff that can be done to the old E engine to improve its thermal efficiency There are some very old E4 engines with do-it yourself split aftercooler systems ( 2 MP45's on Nantucket that meet Massachusetts's emission reg.s for NOx) that will either give you 5% more power or the same power for 5% less fuel.