BDTL meaning in Regional ?

Answer: What is Ballard Terminal Railroad mean?

The Ballard Terminal Railroad Company LLC (reporting mark BDTL) operates two Class III short line terminal railroads in western Washington, United States. Founded in 1997 to operate a three-mile spur through Seattle's Ballard neighborhood, the Ballard Terminal Railroad has expanded to operate two additional lines in the Puget Sound area, including Eastside Freight Railroad (reporting mark EFRX) from Snohomish to Woodinville, Washington, and Meeker Southern Railroad (reporting mark MSN), a 5 mi (8.0 km) segment from East Puyallup ("Meeker") to McMillin, Washington. Eastside Freight Railroad has ceased operation as of mid 2020.

reference

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Ballard Terminal Railroad Company	Regional
Ballard Terminal Railroad	Regional