7S-005-011D Sentinel Y1/Y3 British Railways (E) 8149 Steam Locomotive - DCC Fitted Class-73 easy-to-understand construction instructions make assembling

easy-to-understand construction instructions make assembling the time machine child's play

Tunnel Portals are built at the entrances to tunnels

Geared for slow prototypical operation

enabling them to carry everything from ballast to signal posts

7S-005-011D Sentinel Y1/Y3 British Railways (E) 8149 Steam Locomotive - DCC Fitted Class-73 easy-to-understand construction instructions make assemblingThe Y1 Y3 sentinel was based on the road going lorry, utilising a similar centrally mounted steam tube boiler and chain drive system to the wheels. Whilst not having the greatest turn of speed (approximately 36mph top speed) these small locos proved capable of pulling a constant draw weight and were considered ideal for shunting in yards and providing motive power along smaller branch lines. These quirky little locos were used by all of the big four