The Gulf Coast Lines included MP's subsidiaries which were the NOT&M,
SLB&M, B&SL, Orange & Southwestern and New Iberia & Northern.

True, but that didn't happen until the mid-late 1920s. Before that, GCL was an independent association of smaller roads cast off during the dissolution of the Frisco empire circa 1915.

Builder's photo of NOT&M 8868, 9/17:
http://www.rr-fallenflags.org/acfx/notm8868asw.jpg

David Thompson