Eckon show a "ES24 Position light ground signal" in their advert in the current 'Railway Modeller' - no web-site - contact CCH Models on 01255 814639. This is the standard triangle arrangement and uses LEDs under the baseboard with 'crystal' optics, whatever they may be.
(I note that Guagemaster are their trade distributers, so it might be worth looking at www.gaugemaster.com or other model railway supplier sites.)
Regards,
John Webb
(I note that Guagemaster are their trade distributers, so it might be worth looking at www.gaugemaster.com or other model railway supplier sites.)
Regards,
John Webb