It would likely do a reasonable job of running TRS 2019 but not at maximum setting.  Trainz is not that hard on CPU's but does require a very top end GPU to run everything at full throttle.  Graphic wise you are talking on the lines of a 1080/2070 or above unfortunately.  
Nice to see someone local who is also interested in Trainz I'm just down the road in Warminster.  Good luck, Peter