A passenger train service operated through from Pontypridd to Nelson station, just short of the Taff Vale Extension line, but access to that line was still problematic.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request. ### Instruction: List the MITRE techniques contained in the text. ### Input: A passenger train service operated through from Pontypridd to Nelson station, just short of the Taff Vale Extension line, but access to that line was still problematic. ### Response: .