<p>To ask the Secretary of State for Transport with reference to British Standard BS EN15663:2009, Railway applications, what the (a) usable standing area vehicle reference and (b) definition of vehicle reference masses is for (i) long distance and (ii) other rolling stock currently in use on the UK rail network or on order for future use; when that standard was last revised; and what the usable standing area vehicle reference and definition of vehicle reference masses were under the previous version of that standard.</p>