Your rant implies that you don't want to know the real reason Siemens won the contract. You have pre-judged it.
It has nothing to do with the Tories, and it's not just "money" - it's about getting the right product to meet the specified need. The specification was set out by transport experts (not politicians) under the previous Labour government and the contract was managed under EU law by UK permanent civil servants. It would have cost £billions to change it by the time the current government came to power.
Basically the contract was asking for "whole life" provision and maintenance of the train fleet. This means building and supplying the trains themselves and then building and running maintenance depots for the next 20 or more years. Siemens can do this and have a proven record to show for it - even in the UK (for example, they have built a super new train maintenance depot in Southampton). This will provide hundreds of long term highly skiiled (and paid) NEW jobs. Bombardier just could not match this service or the price.
Siemens will bring jobs to the UK to keep these trains going. These will be 20 or 30 year jobs, not just the 4 year jobs that the train building contract has.
Also, like many things, the trains will have Siemens on the maker's name plate but large numbers of component parts will be made in the UK. These trains are nothing like the "Thomas the tank engine" ones. They're pretty much computers on wheels, and WE in the UK are good at making electronic components (and suspension units etc). You can't really tell these days exactly where many things are made.
For example: there are thousands of "Japanese" cars in the UK which have actually been built in England from parts made in England, Wales and Japan. Significant Volkswagen components are made in the north of England, etc. Unless you took the trouble to look into these things you wouldn't know where they really come from.
Incidentally, the bulk of the UK-owned car industry collapsed in the 1960s and 1970s under Labour governments.
It would hardly be "patriotic" to spend twice as much of taxpayer's money on buying the trains from Bombarider and then spending twice as much again to keep them maintained (by different people) over their working life.
Siemens are also in the lead to provide the replacement trains for the Eurostar fleet. This has upset the French because they wanted their own manufacturers to be used. But that won't happen for exactly the same reasons as apply to Crossrail.
The people you should rant at are the Canadian directors of Bombarider who are running the company in such a way that the English management team can't possibly meet the price, quality and service standards of Siemens.
If you care about British jobs then look at all the "non-patriotic" foriegn objects in your house: camera, hi-fi, television, cooker, furniture (ever been to Ikea?), car, bike, motorbike, decorative lights, carpets, clothes (shirts, shoes, trainers) etc. Almost everything can still be provided by UK makers if you're willing to look for them - and pay the price. Are you going to blame the government for this?