The brakeman claims the brakes are inoperative and it is shown that a brake line is disconnected. Yet, when he claims to have reversed the polarity of the engine's electric motors, in the following scenes, sparks are not only coming from the locomotive's wheels but also all of the cars too.
Hetty says that there are "rumours" of Al Qaeda attacks on rail lines, and Kensi laughs at the idea of train terrorism. This shows a shocking level of ignorance and sickening level of levity at the deaths of hundreds of innocent civilians.
Every person in the room, except Deeks, should have been fully aware of 3 attacks on rail lines in capital cities within the space of 6 years; Madrid in 2004, London in 2005, and Moscow in 2010.
When discussing astrology Deeks claims to be Capricorn and Kensi calls him a goat. Deeks corrects her and call himself a ram. However, Kensi is correct and Deeks is wrong. Capricorn is the goat, Aries is the ram.