Work to date comprises a nicely made chassis which runs on air in either direction, and a well-built boiler - bearing a Northern Association club number, stamped on the backhead - with neatly flanged plates and showing good solder penetration.
| gauge | 3 1/2 inch gauge |
| length/inches | 28 1/2 |
| width/inches | 8 |
| height/inches | 10 1/2 |
| weight/kg | 22 |
| wheel material | cast iron |
| axlebox type | plain bearing |
| cylinder material | gunmetal |
| valve type | slide |
| valve gear | Walschaerts |
| reverser type | pole |
| boiler number | N4-90-376 |
| year built | 2003 |
| CE mark | n/a - non-commercial |
| boiler type | locomotive |
| boiler material | copper |
| boiler construction | silver soldered |
| mechanical pump | 1 |