In 1929 the LMS tested a Sentinel as a possible light shunting engine, quite possibly intending to replace some of the 50+ years old 0-4-0 locomotives on dockside shunting duties. The works shunter number 6515, the former GWR 12 was used and the LMS placed an initial order for 4 Sentinels, 7160 to 7163 later renumbered 7180 to 7183. At nationalisation these engines were distributed between Sutton Oak (2) Ayr (1) and Shrewsbury (1) sheds. The LMS also purchased a single-speed example of the later 'balanced engine' design Sentinel, plus two Sentinels which were working on the S&DJR.
Sentinel Specification.
- 3 body types
- 2 chassis options
- Heavyweight Diecast chassis
- All wheel drive (Single motor)
- All wheel pickup
- Separate detail parts
- In-line brake shoes
- Sprung buffers
- 3-link coupling chain and hook
- Option to fit Dapol coupling pocket
- Representation of chain drive to axles.
- Turned & blackened wheels to O gauge standard
- Firebox flicker
- DCC 21 pin decoder socket
- Provision for speaker
- ‘Positionable’ door
- Fine standard of separate detail parts.
- Whistle options
- Etched detail
- bodyside grills
- chimney detail
- Lamp brackets
- Large amount of interior detail.