I believe any of these would be a direct LED replacement for your locomotive:
This place has different LED lenses. Scroll about half way down to the 14V LED bulbs and select the E10 Screw Base Focused Led Bulbs Warm White or E10 Screw Base Inverted Lens Led Bulbs Warm White depending on orientation.
As for command control, ERR has the product line you need. http://www.3rdrail.com/err-3rdrail/ shows that your 18046 should use the AC Commander