Help needed with railway sleepers on a slope.
Thinking of using railway sleepers as an edging between lawn and a border (4.8m wide) which is slightly raised above level of lawn. Garden slopes right to left approx 8 deg. slope. Should i keep the sleepers level, or just let the sleepers follow the slope? which would be the easy option.

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The fence is sloping following same slope as the front of the border.