Although built to the same scale as the Hughes/Kibbey portable design published nearly 40 years later in "Model Engineer" magazine, it's a significantly large engine, presumably based on one of Marshall's larger designs.
| length/inches | 21 1/2 |
| width/inches | 12 |
| height/inches | 17 |
| wheel material | cast iron flywheel 9 inch diameter |
| cylinder material | gunmetal |
| valve type | slide |
| valve gear | single eccentric |
| boiler type | locomotive |
| boiler material | copper |
| safety valve(s) | 1 |
| safety valve type | spring |
| whistle | yes |