A short passing loop was built at Llangefni station in 1877 for engines to run round , but at only 40 yards (37 m) long it was not of much use for allowing passenger trains to pass each other. A refuge siding was built for freight trains at Llanerchymedd in 1878, along with an engine shed in Amlwch. In 1882, new station buildings replaced the basic wooden sheds at Holland Arms, Llangwyllog and Rhosgoch, as well as development of the junction at Gaerwen into a full double junction , and a second signal cabin built there. An extended Amlwch station received a canopy by 1884.  The staff and ticket system was supplemented with block working in 1886, and was replaced with the electric staff system in 1894. 
Athletes, like all others, may have illnesses or conditions that require them to take particular medications. If the medication an athlete is required to take to treat an illness or condition happens to fall under the prohibited list, a therapeutic use exemption may give that athlete the authorization to take the needed medicine. Criteria for granting a therapeutic use exemption are 1.) The athlete would experience significant health problems without taking the prohibited substance or method, 2.) The therapeutic use of the substance would not produce significant enhancement of performance, and 3.) There is no reasonable therapeutic alternative to the use of the otherwise prohibited substance or method. Note hormone replacement therapy (HRT), . supplementing with prescribed testosterone in any form to raise testosterone levels due to natural decreases that occur with aging (even if to just elevate levels to within ‘normal’ ranges), is NOT considered a medicinal exception. Persons using HRT would not be eligible for WPA/NANBF/IPE competition.