Auction Catalogue: Great Central Railwayana, 19 January 2008
| Lot 33 | A North Eastern Railway Tyers Permissive Block Instrument indicating "Train On Line/Line Closed/Line Clear", the positions repeated below within a glazed brass aperture above the commutator, excellent original condition. |
| This lot sold for £130 |
The auction catalogue page that includes a photograph of Lot 33 is shown below:
