Haven't you, or one of you colleagues already asked this. Some TRAIN related system/ equipment company went out of business waiting for repeat business, or designed replacement equipment in the mean time.
Generally if the device is protected against copying you'll have to find some one with the ability to extract the data from a functional device, depending on the process it might be destructive. Automotive Chipping Forums?
Find a company that specializes in reverse engineering and code extraction from legacy devices.
You might want to find a universal programmer which supports the ST90. Might have to look for equipment of contemporary age, perhaps on eBay. Companies like Elan, Stag, Logical Devices, DataMan, spring to mind.
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In the datasheet inform that you have to use an EPB but it doesn't say which one it also indicates to buy at SGS-THOMSON I've looked and can't find this store on the internet can someone help please!