It is possible, but when comes to squeezing in more profits, they would rather fill every inch of the train or if even possible, squeeze 2 pple under the seat, than to operate another train.what you said is true but I believe at the current state, there is still room to increase frequency
Back in 80s and 90s, train frequency is 3-4 min during off peak hours. Somehow in 2000s, some idiots decided to reduce the frequency during off peak hours.
