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- up-diffused technological object 1
- upbringing 1
- update of capital assets 1
- update of non-current assets 1
- updating 4
- updating of freight rolling stock 1
- upgrading 3
- upgrading of services 1
- upgrading services 2
- upgrading transport services 1
- upper part of the railway track 1
- upper structure 1
- uptime 1
- urban environment 1
- urban rail transport 1
- urea resin 2
- urgent determination 1
- usage diesel locomotive 1
- use 2
- use an infrastructure 1