Referring to the earlier datasheet link, your last photo has a "-P" suffix in the part number which says it has upgraded contacts which means it can handle even more power. But for an O-gauge application, even the standard part (without the -P suffix) is way more than enough power handling capability...hundreds of times more capability than what a 153 block signal would require.
But for block signal applications controlling a red light and a green light, to the earlier discussion, I still think you want an SPDT or Form 1C relay (part number starting JA1c) which will have the "extra" contact that went missing in the eBay part you mentioned. Note that your latest pic shows a part number starting JA1a... which means it too will be "missing" a contact.
