?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Parkins%2C+A&rft.aufirst=A&rft.aulast=Parkins&rft.tpages=60&rft.title=GPS+on+the+railway%3A+A+study+of+the+value+of+incorporating+knowledge+of+the+track+in+a+train+positioning+solution&rft.date=November+2005&rft.degree=Masters&rft.inst=UCL+(University+College+London)