Texas Star F unit # 407 sits at NRE locomotive shops in Mt. Vernon, IL awaiting shipment on 12/31/2012, bought by the Norfolk Southern Railway as a re-build for more new F units in the famous "OCS" scheme which will take place at Altoona, PA.
The Chicago and North Western was well known for that. That light housing once housed a MARS light. It was a mechanical oscillating light unit that was intended to visually grab the attention of anyone near the tracks. When it malfunctioned, it was a pain to repair. Rather than replace it with a fixed headlight with a wider beam, they put a bell there.