Texas Civil Practice and Remedies Code - CIV PRAC & REM § 17.093. Service on Foreign Railway

(A) handles trains for two or more railway corporations, at least one of which is the foreign corporation and at least one of which is a domestic corporation; and

(B) handles trains for the railway corporations over tracks that cross the state's boundary and on tracks of a domestic corporation within this state; or

(A) has an office in this state; and

(B) sells tickets or makes contracts for the transportation of passengers or property over all or part of the line of the foreign railway.