How much it costs for a screen door?
A $126m contract to instal screen doors for 36 MRT stations was awarded to ST Electronics and this has resulted in several discussions in cyberspace, all trying to guess how much is the cost of a screen door. The numbers vary from $60k to $100k per door. Let me try another guess. Each train has 6 cars with 2 doors each on either side, and only one side of the doors will be in operation at the station. And with 36 stations with one platform each with two sides, the number of screen doors should be 6 x 2 x 36 x 2 = 864. This works out to be $145.8k per door. If we add 2 more platforms for the interchanges at Jurong East and Tanah Merah, assuming each has 2 platforms instead of 1, then the additional number of platforms shall be 48, giving a grand total of 912. The cost of each screen door shall be $138k. Now, I think I am right on this number and any variation will be due to stations with more than one platform that are not accounted for and can be adjusted accordingly. So at $138k per screen door, this amount could actually buy a Mercedes Benz or a new 3 rm HDB flat in the new towns. In other words the $126m can buy 912 Mercedes Benz or 912 3rm HDB flats. The screen doors are indeed a little costly right? Correction. There are 24 doors on each side of a train instead of 12 doors as computed above. 4 per car instead of 2. Thus the cost per screen door should be halved, ie $69k. This is close to the actual number given by LTA at $65,600.