An older engine, it runs well on air down to low speed, with some wear apparent in beam pivot bearings and eccentric strap.
| length/inches | 14 |
| width/inches | 9 |
| height/inches | 15 |
| weight/kg | 6 |
| wheel material | brass |
| axlebox type | plain bearing |
| cylinder material | gunmetal |
| valve type | slide |
| valve gear | single eccentric |