X40
X40 may refer to:
- Boeing X-40, test platform for the X-37 Future-X Reusable Launch Vehicle
- SJ X40, series of electric multiple units operated by SJ of Sweden
- Southern Vectis route X40, bus route on the Isle of Wight, England
- ThinkPad X40, laptop computer by Lenovo
- Bestune X40, a subcompact crossover
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