The constant 18V via Lionchief (PnP) track power is potentially too much for the 14V #161 bulb. Even with the extant heat deflector, it may even melt the roof at 18V. Note that a LED could be installed, but it too would be overdriven at 18V without additional circuit complexity.
As you indicate, 12-14V is more reasonable. Since Lionel did not provide Fahnestock clips, you will need to connect the wires directly to an appropriate 12-14V power source such as the CW-80 in the traditional manner, i.e. stripping/ splicing/ twisting wires together.
Note you could connect the wires to the track- provided that the track voltage is set in the traditional 12-16V operating range.
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