January 1966, 64B had 90 main line diesels allocated, comprising:

Clayton Type 1 (34)

BRCW Type 2 (20)

EE Type 4 (19, max)

Brush Type 4 (9, max)

EE Type 5 (8, max)

January 1967, the fleet has grown to nearly its maximum size, 140 locos call 64B home:

Clayton Type 1 (47, max) - Haymarket had the largest single depot allocation of Claytons during the period 5/66 - 7/67

EE Type 1 (4) - at the time of 64B's largest ever allocation, 144 in May '67, this stood at 5

BR-Sulzer Type 2 1,160 hp (15, max)

BR-Sulzer Type 2 1,250 hp (7, max)

BRCW Type 2 (18)

EE Type 3 (13) - from May - August '67 this stood at 14

EE Type 4 (19, max)

Brush Type 4 (9, max)

EE Type 5 (8, max)

January 1968, fleet shrunk to 129 principally through wastage of the Claytons and transfer away of the 24s:

Clayton Type 1 (37)

EE Type 1 (8, max)

BR-Sulzer Type 2 1,160 hp (10)

BR-Sulzer Type 2 1,250 hp (7, max)

BRCW Type 2 (19)

EE Type 3 (12)

EE Type 4 (19, max)

Brush Type 4 (9, max)

EE Type 5 (8, max)

January 1969, line closes except for freight to Hawick and Lady Victoria pit, 64B's allocation has dropped to 93:

Clayton Type 1 (17)

BR-Sulzer Type 2 1,160 hp (8)

BR-Sulzer Type 2 1,250 hp (7, max)

BRCW Type 2 (21, max)

EE Type 3 (10)

EE Type 4 (18)

Brush Type 4 (4)

EE Type 5 (8, max)