Fitted with boiler feed pump and Stephenson's reversing gear, the engine turns over freely and runs on air - albeit in desultory fashion - forwards, not as good in reverse.
| length/inches | 8 1/2 |
| width/inches | 7 |
| height/inches | 11 1/2 |
| weight/kg | 7 |
| cylinder material | cast iron |
| valve type | slide |
| valve gear | Stephensons |
| reverser type | screw |
| lubricator type | mechanical |
| mechanical pump | 1 |