Trucks: B-B
Nos. 1-2 Welded, Nos. 4-5 Rigid, No. 6 Swivel type
Engine:
Nos 1-2: 2 x Caterpillar D-17000 V-8, 190 hp
Nos. 4-5: 2 x Caterpillar 6 cylinder 200 hp
No. 6: 2 x Caterpillar 8 cylinder 200 hp
Nos. 1,2,6 – 380 hp.
Nos. 3-5 – 400 hp.
Operating weight: Nos. 1-2: 88,000 lbs., Nos. 4-5: 89,000 lbs., Nos. 6: 92,180 lbs.
Tractive effort: Nos. 1-2: 13,000 lbs., Nos. 4-5: 15,500 lbs. No. 6: 13,000 lbs.
Length: 33′ – 5″
| Road no. | Class | Built date | Builder’s no. | Order no. | Former road no. | Retired | Notes / disposition |
| 1 | ER-4a | May 47 | 28349 | 7751 | Assigned No. 1500, renumbering not done, re# directly to No. 1 To Greater Winnipeg Water District No. 103 Dec 66, to Ontario Southland, to Port Stanley Terminal Railway No. L-3 1994. | ||
| 2 | ER-4a | May 47 | 28350 | 7752, 1501 | To Bowater-Mersey Paper (Liverpool, NS) No. M-563, to Musquodoboit Harbour Railway Museum 1991 | ||
| 3 | ER-4b | Sep 56 | 32654 | Planned to be No. 150 but delivered as No. 3 To International Minerals & Chemicals (Yarbo, SK) No. 2 May 62 | |||
| 4 | ER-4b | Sep 56 | 32655 | AEM 14857 | Planned to be No. 1503 but delivered as No. 4 To STELCO (Edmonton, AB) No. 4 May 67 | ||
| 5 | ER-4b | Sept 56 | 32656 | AEM 14857 | Planned to be No. 1504 but delivered as No. 5 To STELCO (Welland, ON) No. 5 Jun 30 69, to Port Stanley Terminal Railway 1994 | ||
| 6 | ER-4c | Sep 42 | 15124 | AEM 19674 | Originally Minneapolis & St. Louis No. D-842, re # No. 11. To CN Feb 57, rebuilt with MU by GE. To Indusmin Ltd. (Pine Grove, ON) Apr 70, to Andrew Merrillees (D) AMLX No. 6 |