Prepping to Build a Train Set

In the coming weeks and  months, I am going to build my HO-scale train set.  The theme will be inner-city or downtown.  No inner-city would be complete without the police.  One of the first things I have purchased for this project is a fleet (4) Dodge Charger police cars.  I am going to put strobe lights on one of them.   The cars are 1:87 scale.