CN GMD HBU-4 Nos. 500 – 522

23 units, built by GMD, weight 258,000 lbs., continuous tractive effort 57,000 lbs. Used in hump service mated with GP38-2s. Renumbered to the 500 series in 1990. Equipped for remote control operation.

Number	Class	Build date	Builder’s no.	Original road no.	Subsequent road no.	Retired	Disposition / Notes
500	GH-00a	Oct 78	A3966	260		2020
501	GH-00a	Oct 78	A3967	261		Jan 13	To New Brunswick Southern No. 003 2013
502	GH-00a	Oct 78	A3968	262		2020
503	GH-00a	Oct 78	A3969	263	600
504	GH-00a	Oct 78	A3970	264		2020
505	GH-00a	Oct 78	A3971	265
506	GH-00a	Oct 78	A3972	266
507	GH-00a	Oct 78	A3973	267
508	GH-00a	Oct 78	A3974	268		Dec 12	To New Brunswick Southern No. 002 2013
509	GH-00a	Oct 78	A3975	269		Jan 13
510	GH-00a	Nov 78	A3976	270
511	GH-00a	Nov 78	A3977	271		2020
512	GH-00a	Nov 78	A3978	272
513	GH-00a	Nov 78	A3979	273		2020
514	GH-00a	Nov 78	A3980	274		2021	To Lambton Diesel Specialists (Sarnia, ON) 2022
515	GH-00a	Nov 78	A3981	275		2021
516	GH-00a	Nov 78	A3982	276	601
517	GH-00a	Nov 78	A3983	277
518	GH-00a	Nov 78	A3984	278
519	GH-00b	Jul 80	A3859	279		Jan 3 08	To New Brunswick Southern No. 008 May 08
520	GH-00b	Jul 80	A3860	280
521	GH-00b	Jul 80	A3861	281
522	GH-00b	Jul 80	A3862	282		March 12 2015