GMD1 Nos. 1600-1614

15 units – built by GMD, 1,200 horsepower, A1A-A1A trucks. From October to December 1988 these locomotives were remanufactured at Pointe St. Charles shops for continued service on lightweight branch lines. The remanufacturing included new power assemblies upgrading the engine to a 12-cylinder 645C, the cylindrical spark arrestors on the exhaust stacks were eliminated (the engines were equipped with spark-arresting exhaust manifolds, the air brakes were upgraded to a 26L system and the traction motors were upgraded. After the remanufacturing CN classified these locomotives as GMD1A.

Externally anticlimbers, plow pilots and ditch light brackets were added at both ends and all weather cab windows were added.

In the cab the controls were reversed to make the short hood the front, a hot plate, refrigerator and toilet were added.

These units were painted in a revised version of CN’s 1973 livery featuring a red short hood, black cab sides and roof, and grey-outlined gold-coloured road numbers on the cab side. They received cast-bronze Pointe St. Charles builder’s plates denoting the status as remanufactured locomotives.

In 1998 CN had no need for lightweight six-axles GMD1s for branch line service so began converting the 1600 series GMD-s to B-B trucks and renumbered them to the 1430 – 1444 number series.

Road Number	Class	First road number	Rebuild date	Third road number	Conversion date
1600	GR-612a	1007	Oct 14 88	1430	Feb 2000
1601	GR-612a	1025	Oct 14 88	1431	2000
1602	GR-612a	1008	Oct 25 88	1432	1999
1603	GR-612a	1026	Oct 27 88	1433	1999
1604	GR-612a	1010	Oct 27 88	1434	May 1 98
1605	GR-612a	1011	Oct 31 88	1435	May 27 98
1606	GR-612a	1028	Nov 7 88	1436	May 1 98
1607	GR-612a	1012	Nov 11 88	1437	1998
1608	GR-612a	1019	Nov 18 88	1438	Aug 6 98
1609	GR-612a	1032	Nov 23 88	1439	1998
1610	GR-612a	1014	Dec 2 88	1440	Mar 22 98
1611	GR-612a	1038	Dec 9 88	1441	Mar 22 98
1612	GR-612a	1031	Dec 9 88	1442	Jun 5 98
1613	GR-612a	1036	Dec 19 88	1443	Jul 3 98
1614	GR-612a	1046	Dec 88	1444	1998