Barlow was appointed as royal commissioner for railways and in the 1830s and 1840s he conducted several experiments to see if the limitation on gradients and radius of curvature proposed by Stephenson was correct.
Barlow ay hinirang bilang hari o reyna komisyonado para sa railways at sa mga 1830s at 1840s siya na isinasagawa ng ilang mga eksperimento upang makita kung ang mga limitasyon sa gradients at radius ng kurbada iminungkahi ng Stephenson ay tama.