Although most Class I’s retired them by the 1980s, some remain in rebuilt form as switchers. The SD9 was the second model of EMD’s SD line of locomotives, following the SD7, a lengthened, six-axle ...

For end-cab switchers, the MR&T locomotive fleet might include units ... It's possible the MR&T could have had a few EMD SD7 and SD9 diesels for branch line duty. Being a Wisconsin-based railroad ...