Classic UK Minitrix Models  -  N209 Evening Star
9F Valve Gear

And the bulb can slot into place. Its actually quite fiddly with the housing in place to get the lip of the bulb behind the metal keeper and the rear contact of the bulb in front of the brass sprung tab.

Maintaining Classic UK Minitrix Locos
The Minitrix trademark is currently owned by Märklin Inc.  Gebr. Märklin & Cie. GmbH, Stuttgarter Straβe 55-57, D-73033 Göppingen, Baden-Württemberg

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