![Presto paying machines using the honour system to enter the Union subway station in Toronto Ontario Canada Stock Photo - Alamy Presto paying machines using the honour system to enter the Union subway station in Toronto Ontario Canada Stock Photo - Alamy](https://c8.alamy.com/comp/HP9CA6/presto-paying-machines-using-the-honour-system-to-enter-the-union-HP9CA6.jpg)
Presto paying machines using the honour system to enter the Union subway station in Toronto Ontario Canada Stock Photo - Alamy
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![Science of railways . The Presto Coupling Nut. This cut shows the Presto Nut with spring and sectionalring removed, ready to be slipped over collar of union sleeve,without having to take Science of railways . The Presto Coupling Nut. This cut shows the Presto Nut with spring and sectionalring removed, ready to be slipped over collar of union sleeve,without having to take](https://c8.alamy.com/comp/2CGWJCM/science-of-railways-the-presto-coupling-nut-this-cut-shows-the-presto-nut-with-spring-and-sectionalring-removed-ready-to-be-slipped-over-collar-of-union-sleevewithout-having-to-take-down-the-pipe-melt-off-the-sleeve-ornipple-and-braze-it-on-again-as-has-to-be-done-with-ordinarynuts-with-this-nut-there-is-no-necessity-of-an-engine-havingto-be-laid-off-its-run-on-account-of-failure-of-injector-couplingsoccurring-at-a-critical-time-as-with-the-presto-nut-a-newnut-can-be-applied-in-a-moment-without-the-aid-of-eitherpipeman-or-coppersmith-and-at-any-place-on-the-road-locomotive-appli-2CGWJCM.jpg)