understandable

adj

1. Capable of being understood; comprehensible.
2. Capable of being accepted or excused under the circumstances.

   “The original branch was 5¾ miles long, from Llantrisant to Cowbridge only, but in 1889, the T.V.R. [Taff Vale Railway] obtained powers […] to continue the line for 6½ miles south to the coast at Aberthaw, ostensibly for the purpose of serving the important limestone works there, but one suspects other motives, including an understandable desire on the part of the T.V.R. to put a spoke in the wheel of the oncoming Barry Railway !”