Left to right:
K-Line, Lionel, Lionel, GGD. All are ESE observation cars redone into Fort Worth& Denver or Colorado & Southern cars for the TEXAS ZEPHYR or SAM HOUSTON ZEPHYR. None are worthy of a closeup photo, but I sure had fun recreating them.
What I lack is the ability to light up all four of them at once. They can be seen individually here:
CB&Q and Fort Worth & Denver passenger cars | O Gauge Railroading On Line Forum (ogaugerr.com)
Happy TET !!!