Whyte notation
The Whyte notation for classifying steam locomotives by wheel arrangement was devised by Frederick Methvan Whyte, and came into use in the early twentieth century following a December 1900 editorial in "American Engineer and Railroad Journal". The notation counts the number of leading wheels, then the number of driving wheels, and finally the number of trailing wheels, groups of numbers being separated by dashes. Other classification schemes, like UIC classification and the French, Turkish and Swiss systems for steam locomotives, count axles rather than wheels.
Yat
The spelling reform was finally promulgated by the Provisional Government in the summer of 1917. It appears not to have been taken seriously under the prevailing conditions, and two further decrees by the Soviet government in December 1917 and in 1918 were required. Orthography thus became an issue of politics, and the letter "yat", a primary symbol. Émigré Russians generally adhered to the old spelling until after World War II; long and impassioned essays were written in its defense, as by Ilyin in c. 1952. Even in the Soviet Union, it is said that some printing shops continued to use the eliminated letters until their blocks of type were forcibly removed; certainly, the Academy of Sciences published its annals in the old orthography until approximately 1924, and the Russian Orthodox Church, when printing its calendar for 1922, for the first time in the new orthography, included a note that it was doing so as a condition of receiving a license for impression. To the builders of the new regime, conversely, the new spelling visibly denoted the shining world of the future, and marked on paper the break with the old. The large-scale campaign for literacy in the early years of the Soviet government was, of course, conducted in accordance with the new norms.